Yesterday I was presented with an interesting question: How can I design a user control that change appearance when the windows containing it is maximized? Thanks to WPF binding and Triggers the solution is simple, suppose you want to create a border control that change thickness when the windows that contains this User Control is [...]

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Wpf Design Time Data part 3
on November 30th, 2012
On category: WPF

Wpf Design Time Data – An introduction Wpf and Design data, Use a concrete class If you followed the suggestion of my first couple of posts you should have a dedicated Design Time view model for each real View Model in your application so you can effectively use Design Time Data. You should be aware [...]

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Survive binding of DataGrid in WPF
on November 23rd, 2012
On category: WPF

DataGrid is one of the most annoying control in WPF because it sometimes has really different behaviors from other controls. The very first problem is that inside DataGridColumns the DataContext is not what you expect. Suppose you have this simple scenario in MVVM: an ObservableCollection of Objects, each one has IsSelected property and you want [...]

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As you probably already know, you can access WPF controls only from a UI Thread and when I use MVVM each PropertyChanged message check for the need to execute on the UiThread to avoid cross-thread problems. Instead of using the Dispatcher in each property changed sometimes you can find code that does a little optimization [...]

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Wpf Design Time Data
on October 22nd, 2012
On category: WPF

A really cool aspect of WPF is the ability to use DesignTimeData, a feature that added with MVVM pattern gives a unique DesignTime capabilities to programmer and designers. To use Design Time Data you can simply add a new xaml file and use the Build Action DesignData as visible in Figure 1 Figure 1: A [...]

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